precision guidance kit (pgk) · a premier aerospace and defense company 1 approved for public...

A premier aerospace and defense company

1 Approved for Public Release, PAO #20-12, 22 CFR 125.4(b)(13) applicable

Precision Guidance Kit (PGK)

Lyle H Johnson, PhD

System Analysis

Armament Systems

[email protected]

May 15, 2012

Approved for Public Release, PAO #20-12, 22 CFR 125.4(b)(13) applicable

mailto:[email protected]



Overview

PGK Concept Description

Challenges in Developing PGK

• Packaging

• Physics

• Do More without More

Results

POC information



Legacy Artillery Capability and Inventory

Conventional > 200m CEP at max range 50m Threshold, 30m Objective

CEP at max range

• Reduced Dispersion

• Improved Efficiency

• Greater Effectiveness




4

Replace standard fuze with GPS guidance kit

• Desire compatibility with all current US artillery inventory

• Significantly increase accuracy of current conventional artillery rounds

• Maintain current fuzing functions

Requirement: Meet accuracy requirement of 50m (T) / 30m (O) CEP

• CEP (Circular Error Probable – radius of a circle centered at the target that contains one-half (1/2) of the projectiles fired

PGK Program Objectives

Insert Guidance

Fuze Here



Packaging – Primary Challenge for PGK

LG WM2233HD Front Load

Washing Machine with SenseClean

System for intelligent fabric care

PGK

Complexity Comparison Approx 100 Parts

30 Metal Parts, 25 Plastic Parts

~50 Electronics Boards/Assy’s

Packaging Drivers

• Structural Survivability

• Maximize Packaging Volume

• Electrical Design – Power Management

• Extensive Use of Simulation

• DFA/DFM

• Reduce Size & Maintain Producibility

And Then We Do This!




6

Packaging – Primary Challenge for PGK

TD Phase

•Single Projectile (M549)

•Single Range and Trajectory

•Single Environment

•No EPIAFS Interface

•No Fuzing Functions

•Non-Tactical Form-Factor

EMD Phase

•Two Projectiles

•All Ranges

•All Environments

•EPIAFS Interface

•All Fuzing Functions

•Tactical Form-Factor

Design Verification Testing

Aug 2011

48 PGK Units Fired

100% Safe

All accuracy and range

requirements met

Primary Features that make PGK Possible

•Fixed canards – no actuators

•GPS up-finding – no inertial sensors

•Electronics spin with projectile – small bearings, no slip rings

•High power resistor technology – small load element

•Electronics packaging

Other Unique Features

•Super capacitor and alternator power – no battery required

•Innovative and simple G&C algorithms

•Small GPS Receiver with very fast acquisition

•Small patch GPS Antenna

•Built-in telemetry function



Fixed Canard Assembly Produces Nose Lift and Counter-Rotation Torque

PGK – The Physics

De-spin

Control

De-spin

Control

4.066 “

One Moving Part (Free to Rotate)

• Fixed canard assembly

Rigidly Mounted (Spin with Projectile)

• Proximity sensor

• Electronics

• S&A and booster



PGK Controlled Flight

Velocity

Canard Lift

Body Lift

a

Magnus

Force

fphase

Net

Maneuver magnitude and

direction a result of vector

addition of:

• Canard Lift

• Body Lift

• Magnus

Artillery Aerodynamics Are Complex

Once Understood They Are Very Repeatable And Manageable

Note: For Fin Stabilized Projectiles, Canard Lift &

Body Lift Are Complementary (Same Direction)



A Bullet Solution

Approach: Fly like a projectile, only make minor corrections to trajectory

Reference Trajectory - the predicted ballistic flight path before shooting the

round using

Expected launch conditions (gun QE, gun AZ, muzzle velocity)

Environment predictions (MET, gravity, Coriolis, etc.)

Aerodynamic model

Robust solution for all indirect fire trajectories

Artillery or mortar

Different zones (muzzle velocities)

Different projectiles

Different QEs (trajectory shapes)

Successfully Conducted Initial Flight with 155mm XM 1128

- Verified preliminary stability and maneuver authority



Doing More Without More

PGK developed during volatile

defense budget environment

PM CAS leading the charge

“Do More Without More” – US Under Secretary of Defense for Acquisition,

Technology, and Logistics (AT&L)



Affordable Precision

Reduced Cost and Time

Source: Jane’s Defense Approved for Public Release, PAO #20-12, 22 CFR 125.4(b)(13) applicable



Result

PGK Delivering Accuracy Beyond Expectation

• PGK – Performance on M549A1 and M795 rounds meeting Circular Error Probable (CEP) requirements through Engineering, Manufacturing, Development (EMD) Phase

• Accuracy Requirement = (T) 50m (O) 30m

• M549A1 > 200m CEP at max range

PGK provides next generation dispersion reduction

for yesterday and today’s ammunition stockpiles

o Minimize collateral damage

o Improved Logistics

o Do More without More

Approved for Public Release, PAO #20-12, 22 CFR 125.4(b)(13) applicable




14

PGK Applications

M107

M549

M795

155mm High

Explosive

Artillery

155mm Cargo

Artillery

105mm Artillery International

Markets

Navy Rounds

Mortars

Novel Guidance and Control Approach

Has Widespread Applicability

Current US programs

Potential applications



Contact Information Program Contact Information

Jay Annis

Director – Precision Guidance Systems

ATK Advanced Weapons

+1-763-744-5019

[email protected]

Russ Hill

PGK Project Management Engineer

Guided Precision Munitions and Mortar Systems

US Army

+1-973-724-2236

[email protected]

Innovation … Delivered.

precision guidance kit (pgk) · a premier aerospace and defense company 1 approved for public...

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